Power Systems
Critical visual voltage is the voltage at which

 corona is visible with blue or violet colour
 both 1 and 2
None of these
 corona is just initiated

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 always
 if the shunt admittances at the buses are ignored
 if the mutual couplings between transmission lines are absent
 if both 2 and 3 are satisfied

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